You can view an overview of a repository's activity through Pulse. Pulse includes a list of open and merged pull requests, open and closed issues, and a graph showing the commit activity for the top 15 users who committed to the default branch of the project in the selected time period.
On GitHub, navigate to the main page of the repository.
Under your repository name, click Pulse.
Filtering by time
By default, Pulse shows the last seven days of repository activity. To choose a different time period, click the Period dropdown in the upper-right corner of the Pulse overview.